<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
      <!--添加角色按钮-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表区域-->

      <el-table :data="roleList" border stripe>
        <!--展开列-->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', index === 0 ? 'bdtop' : '', 'vcenter']"
                    v-for="(item1, index) in scope.row.children"
                    :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag  closable
                         @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <!--for循环嵌套二级权限-->
                <el-row :class="[index === 0 ? '' : 'bdtop', 'vcenter']"
                        v-for="(item2, index) in item1.children"
                        :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success"
                            closable
                            @close="removeRightById(scope.row,item2.id)">
                      {{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning"
                            v-for="(item3, index) in item2.children"
                            :key="item3.id"
                            closable
                            @close="removeRightById(scope.row,item3.id)">{{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!--索引列-->
        <el-table-column type="index" label="序号"/>
        <el-table-column label="角色名称" prop="roleName"/>
        <el-table-column label="角色描述" prop="roleDesc"/>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" size="mini"
                       icon="el-icon-setting"
            @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!--分配权限对话框-->
    <el-dialog title="分配权限"
       :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed">
      <!--树形控件-->
      <el-tree :data="rightsList"
               :props="treeProps"
               show-checkbox
               node-key="id"
               default-expand-all
               :default-checked-keys="defKeys"
               ref="treeRef"></el-tree>
      <span slot="footer">
        <el-button @click="setRightDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="allotRights">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制分配权限对话框
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点ID值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: ''

    }
  },
  created() {
    this.getRoleList()
  },
  methods: {
    // 获取所有角色列表
    async getRoleList(){
     const {data: res} = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败! ')
      }

      this.roleList = res.data
    },
    // 根据Id删除对应权限
    async removeRightById(role, rightId){
      // 弹框提示是否删除
    const confirmResult = await this.$confirm('是否删除该权限',
      '提示',
      {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除! ')
      }

      const {data: res} = await this.$http.delete
      (`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败! ')
      }

      this.$message.success('删除权限成功! ')
      role.children = res.data
    },
    // 展示分配权限对话框
    async showSetRightDialog(role){
      this.roleId = role.id
      // 获取所有权限列表
      const {data: res} = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败! ')
      }
      // 获取到的数据保存到data中
      this.rightsList = res.data

      // 递归获取三级节点的Id
      this.getLeafKeys(role,  this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归形式, 获取角色下所有三级权限id, 并保存到 defKeys 中
    getLeafKeys(node, arr){
      // 如果当前 node 节点不包含 children树属性, 则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item =>
      this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed(){
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights(roleId) {
      const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) { return this.$message.error('分配权限失败！') }
      this.$message.success('分配权限成功!')
      this.getRoleList()
      this.setRightDialogVisible = false
    }

  }
}
</script>

<style scoped lang="less">
.el-tag{
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>